Mary Birch 
‌Mary and John were married in a religious ceremony on August 16th, 1863 in Upper Norwood.1 They had eight sons and three daughters, named John, <Unknown>, <Unknown>, <Unknown>, <Unknown>, <Unknown>, <Unknown>, <Unknown>, <Unknown>, <Unknown> and <Unknown>.
Family Notes
John Letts met his wife when they were neighbours to each other. They are shown on the 1861 Census immediately next to each other - The 18 year old John is living with the Rawlins Family, Mary Ann Birch with her widowed mother, and I believe a sister to John, Mary Birch living with the Hamblington family.
